<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>自动固定顶部的悬浮菜单栏代码</title>
<meta http-equiv="content-type" content="text/html;charset=gb2312">
<style type="text/css">
*{margin:0;padding:0;}
ul,li{list-style:none;}
#content{width:600px;margin:0 auto;border:1px solid #f00;}
ul li.item{width:400px;text-align:center;margin:20px 100px;background:#00f;color:#fff;font-size:14px;font-weight:bold;height:100px;line-height:100px;}
#float_banner{position:absolute;top:0;left:50%;width:900px;margin-left:-450px;height:30px;line-height:30px;text-align:center;background:#000;color:#fff;font-size:14px;font-weight:bold;z-index:2;}
</style>
</head>
<body>
<div id="float_banner">这里是顶部的横幅，随着页面滚动而浮动</div>
<ul id="content">
<li class="item">第一块内容</li>
<li class="item">第二块内容</li>
<li class="item">第三块内容</li>
<li class="item">第四块内容</li>
<li class="item">第五块内容</li>
<li class="item">第六块内容</li>
<li class="item">第七块内容</li>
<li class="item">第八块内容</li>
<li class="item">第九块内容</li>
<li class="item">第十块内容</li>
</ul>
<script language="javascript">
var speed = 100;
var scrollTop = null;
var hold = 0;
var float_banner;
var pos = null;
var timer = null;
var moveHeight = null;
float_banner = document.getElementById("float_banner");
window.onscroll=scroll_ad;
function scroll_ad(){
scrollTop = document.documentElement.scrollTop+document.body.scrollTop;
pos = scrollTop - float_banner.offsetTop;
pos = pos/10
moveHeight = pos>0?Math.ceil(pos):Math.floor(pos);
if(moveHeight!=0){
float_banner.style.top = float_banner.offsetTop+moveHeight+"px";
setTimeout(scroll_ad,speed);
}
//alert(scrollTop);
}
</script>
</body>
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